Pine Beetles 101
ALBERTA, CANADA
Since 2004 foresters in
Alberta have cut more
than a million infested
trees, hoping to slow
the beetle’s eastward
march. Most felled trees
are burned, like these
near Grande Prairie.
MONTANA
On a ranch near Seeley
Lake (left), a worker
sprays a ponderosa
pine with insecticide
to fend off beetles. But
spraying whole forests
every year would be too
costly and polluting.